Those are the icicles hanging off our bedroom window. Apparently, you are supposed to knock them down in the wee hours of the morning or late at night when people aren't out and about walking the sidewalks. I think we are probably the only ones on our block who haven't knocked theirs down yet. We've heard them being knocked down at 5:30 am. It sounds like bombs hitting the ground. I'm not a fan. So we leave ours. I want to see how long it will get. But, I do hope it doesn't fall on anyone. That would not be pretty. Maybe on a hard day I will get out the hammer and knock them down to relieve some stress.